- ↑ 1.0 1.1
"Ephedra aspera". IUCN Red List of Threatened Species. Version 2012.2. International Union for Conservation of Nature. 2011. Ginkuhà 24 Oktubre 2012.
- ↑ Cory (1938) , In: Rhodora 40: 216
- ↑ L.D.Benson (1943) , In: Amer. J. Bot. 30: 232
- ↑ I.M.Johnst. (1922) , In: Univ. Calif. Publ. Bot. 7: 437
- ↑ Engelm. ex S.Watson (1882) , In: Proc. Amer. Acad. Arts 18: 157
- ↑ 6.0 6.1 Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (ed.) (2011). "Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 24 Septyembre 2012.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- ↑ WCSP: World Checklist of Selected Plant Families. Govaerts R. (ed). For a full list of reviewers see: http://apps.kew.org/wcsp/compilersReviewers.do, 3 Disyembre 2010
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